Evolutionary models for cool brown dwarfs and extrasolar giant planets. The case of HD 209458

I. Baraffe, G. Chabrier, Travis S Barman, F. Allard, P. H. Hauschildt

Research output: Contribution to journalArticle

1019 Citations (Scopus)

Abstract

We present evolutionary models for cool brown dwarfs and extra-solar giant planets. The models reproduce the main trends of observed methane dwarfs in near-IR color-magnitude diagrams. We also present evolutionary models for irradiated planets, coupling for the first time irradiated atmosphere profiles and inner structures. We focus on HD 209458-like systems and show that irradiation effects can substantially affect the radius of sub-jovian mass giant planets. Irradiation effects, however, cannot alone explain the large observed radius of HD 209458b. Adopting assumptions which optimise irradiation effects and taking into account the extension of the outer atmospheric layers, we still find ∼20% discrepancy between observed and theoretical radii. An extra source of energy seems to be required to explain the observed value of the first transit planet.

Original languageEnglish (US)
Pages (from-to)701-712
Number of pages12
JournalAstronomy and Astrophysics
Volume402
Issue number2
StatePublished - May 2003
Externally publishedYes

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planets
planet
irradiation
radii
color-magnitude diagram
transit
methane
diagram
trends
atmospheres
atmosphere
profiles
energy
effect

Keywords

  • Planetary systems
  • Stars: brown dwarfs
  • Stars: evolution
  • Stars: individual (HD 209458)

ASJC Scopus subject areas

  • Space and Planetary Science

Cite this

Evolutionary models for cool brown dwarfs and extrasolar giant planets. The case of HD 209458. / Baraffe, I.; Chabrier, G.; Barman, Travis S; Allard, F.; Hauschildt, P. H.

In: Astronomy and Astrophysics, Vol. 402, No. 2, 05.2003, p. 701-712.

Research output: Contribution to journalArticle

Baraffe, I, Chabrier, G, Barman, TS, Allard, F & Hauschildt, PH 2003, 'Evolutionary models for cool brown dwarfs and extrasolar giant planets. The case of HD 209458', Astronomy and Astrophysics, vol. 402, no. 2, pp. 701-712.
Baraffe, I. ; Chabrier, G. ; Barman, Travis S ; Allard, F. ; Hauschildt, P. H. / Evolutionary models for cool brown dwarfs and extrasolar giant planets. The case of HD 209458. In: Astronomy and Astrophysics. 2003 ; Vol. 402, No. 2. pp. 701-712.
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